Enable OpenGL ES 3.0 context creation from non-conformant configs.

Enable OpenGL ES 3.0 context creation from non-conformant configs.

Allow experimental access to OpenGL ES 3.0 for Android, when the
application explicitly sets the EGL_CONFIG_CAVEAT config attribute
to EGL_NON_CONFORMANT_CONFIG or EGL_DONT_CARE.

Bug b/34029810

Change-Id: I942a6d4812d89446f7045f020df974489c4c0ab3
Reviewed-on: https://swiftshader-review.googlesource.com/8352
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>